Invasion of Chaos (IOC) contains a variety of powerful cards for many different types, including Dinosaur, Insect, Sea Serpent, and Beast. It also contains the immensely powerful "Chaos" monsters, Black Luster Soldier - Envoy of the Beginning, and Chaos Emperor Dragon - Envoy of the End, cards that were so powerful that they became the main cause for the introduction of the "banned" list of cards not allowed in tournament play. Highly sought after cards include the "Chaos" monsters, Levia-Dragon - Daedalus, Dark Magician of Chaos, Strike Ninja and Smashing Ground.